Experimental study of the effectiveness of retrofitting RC cylindrical columns using self-compacting concrete jackets

Dubey, Rahul; Kumar, Pardeep

doi:10.1016/j.conbuildmat.2016.07.079

Cited by 29 publications

(11 citation statements)

References 29 publications

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“…The study consisted of tests on eighteen 1370 mm long specimens to simulate axially loaded RC columns. Although these dimensions are not those of normal columns, the results can be extrapolated to real columns, as has been previously shown: Emberson and Mays [26,27], Ramírez [5], Mourad and Shannag [10], Pellegrino et al [36], Achillopoulou and Karabinis [37], Fukuyama et al [20] and Dubey and Kumar [8].…”

Section: Specimen Geometrymentioning

confidence: 76%

“…Table 4 gives the designation codes of the 18 specimens. 8 The tests were carried out in the ICITECH laboratories at the Universitat Politècnica de València (UPV). The specimens were instrumented with strain gauges at the centre of the four rebars and with LVDTs in the concrete and repair mortar ( Fig.…”

Section: Test Planning Monitoring and Proceduresmentioning

confidence: 99%

“…Later innovations included concrete jacketing [6,7], self-compacting concrete jacketing [8], high performance fibre-reinforced concrete jacketing [9], ferrocement jacketing [10], steel jacketing [11][12][13][14][15][16], and FRP jacketing [17], which were used to increase the column's level of concrete confinement to improve their resistance [18]. Most of the studies [6][7][8][9][10][11][12][13][14][15][16][17] focused on strengthening columns to increase their resististant capacity [19].…”

Section: Introductionmentioning

confidence: 99%

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An experimental study on RC columns repaired on all four sides with cementitious mortars

Ortega

Pellicer

Adam

et al. 2018

Construction and Building Materials

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Structural ageing, action by aggressive agents, accidents, etc., all make it increasingly necessary to apply conservation and maintenance programs to building structures. Columns are some of a building's most critical elements, since the failure of a single column can lead to the collapse of the entire structure or a large part of it. Although great strides have been made in recent years in the field of reinforced concrete (RC) column repair and strengthening, there is room for further improvement in certain areas. This paper describes a study carried out in the ICITECH laboratories (Universitat Politècnica de València) on RC columns repaired on all four sides with cementitious-based mortars. A total of 18 specimens were tested, representing a group of square 20x20 mm 2 columns subjected to compressive axial loads. Different repair scenarios were considered in order to study the influence of the type of mortar used and the presence or absence of bonding agents between the mortar and the column concrete. The results obtained showed that bonding agents have no appreciable effect on the behaviour of the repaired columns. Of the two types of mortar used in the study (Classes R3 and R4), the columns repaired with the lower grade mortar (R3) were seen to behave better. The main novelty of this work lies in the fact that this is the first time that two types of mortar are compared in the repair of four column sides, in addition to the possible use of bonding agents between the mortar and the column.

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Section: Specimen Geometrymentioning

confidence: 76%

Section: Test Planning Monitoring and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An experimental study on RC columns repaired on all four sides with cementitious mortars

Ortega

Pellicer

Adam

et al. 2018

Construction and Building Materials

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“…These reasons have led researchers to switch to new jacketing techniques with alternative materials such as steel [17][18][19], advanced materials such as fiber reinforced polymer (FRP) [20][21][22][23][24][25], textile reinforced concrete or mortar [26][27][28][29] and shape memory alloys [30][31][32], cement-based materials such as ferrocement [33][34][35][36], steel fibrous concrete or mortar [37][38][39][40], high-performance fiber reinforced concrete [41][42][43][44][45][46][47][48], self-compacting concrete (SCC) [49][50][51][52][53][54], and thin slightly reinforced flowable mortar [55,56]. Many of these jacketing techniques have been proved successful substitutes to common RC jacketing.…”

Section: Introductionmentioning

confidence: 99%

“…Many of these jacketing techniques have been proved successful substitutes to common RC jacketing. However, most of these studies investigate jackets as strengthening technique applied to undamaged RC members and only some of them [20,23,25,29,35,37,46,47,[51][52][53][54][55] examine jacketing as a method to repair already damaged RC members, as stated and discussed below.…”

Section: Introductionmentioning

confidence: 99%

Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

et al. 2019

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The effectiveness of slightly reinforced thin U-shaped cementitious mortar jacketing for the repair of damaged shear-critical reinforced concrete beams is experimentally investigated. The test project includes two parts. In the first one, five concrete beams over-reinforced against flexure and under-reinforced against shear with different ratio of closed stirrups were initially subjected to monotonic loading until failure. The initially tested beams have been designed to fail in shear after wide diagonal cracking and to exhibit various strength and deformation capacities along with different levels of damages. In the second experimental part, the heavily damaged beams were jacketed with mild steel small diameter U-shaped transverse stirrups and longitudinal reinforcing bars. The retrofitted specimens using the proposed jacketing technique were tested again following the same four-point-bending load scheme. Based on the overall performance of the beams, it is deduced that the shear strength and deformation capability of the jacketed beams were substantially increased compared to the corresponding capacities of the initial beams. Further, although all beams failed in a shear abrupt manner, the retrofitted ones exhibited reduced brittleness and higher deflections at failure up to six times with respect to the initially tested specimens. The level of the initial damage influences the efficiency of the jacketing. Additional test data derived from relative shear-damaged beam specimens and retrofitted with similar thin jackets is also presented herein in order to establish the effectiveness of this repair system and to clarify the parameters affecting its structural reliability. Comparisons indicated that jacketed beams can alter the failure mode from brittle shear to ductile flexural under certain circumstances.

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Behavior of RC columns strengthened with UHPFRC jackets through grooving method under eccentric loading: A comparative evaluation of steel and synthetic macro fibers in UHPFRC

Eshaghi‐Milasi

Mostofinejad

Saljoughian

et al. 2022

Structural Concrete

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This study aims to examine the behavior of reinforced concrete (RC) circular columns retrofitted with ultra‐high‐performance fiber‐reinforced concrete (UHPFRC) jackets and fiber‐reinforced polymer (FRP) wraps under concentric and eccentric loading. In the present study, for the first time, UHPFRC jackets containing synthetic macro fibers (barchip) were used. The results were then compared with those obtained by UHPFRC containing steel fibers. Moreover, to improve the effect of concrete jacketing on the column behavior under eccentric loading, the innovative interface treatment of the longitudinal grooving method (GM) was applied. For these purposes, 15 such circular columns, 120 mm in diameter and 500 mm in height, were subjected to load eccentricities of 0, 30, and 60 mm. Thus, six columns were retrofitted with UHPFRC jackets 15 mm in thickness that included both steel and synthetic macro fibers (barchip) while another six were strengthened with UHPFRC jackets and intermittent glass FRP (GFRP) warps. The experimental results revealed that load‐carrying capacity raised with the increase of the load eccentricity, as evidenced by enhancements of 283%, 303%, and 401% in the loading capacity of the specimens strengthened with UHPFRC jackets containing both GFRP warps and steel fibers for eccentricities of zero, 30, and 60 mm, respectively, relative to those of the control. In addition, enhancements of 198% and 530% were recorded respectively for ductility and energy dissipation under a loading eccentricity of zero mm in specimens retrofitted with UHPFRC jackets including steel fiber and GFRP warps when compared with the same parameters in the corresponding control specimens. Finally, a previous theoretical model was adopted to derive the axial loading‐bending moment (P–M) interaction diagrams whereby the results of the present study were satisfactorily verified.

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Experimental study of the effectiveness of retrofitting RC cylindrical columns using self-compacting concrete jackets

Cited by 29 publications

References 29 publications

An experimental study on RC columns repaired on all four sides with cementitious mortars

An experimental study on RC columns repaired on all four sides with cementitious mortars

Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

Behavior of RC columns strengthened with UHPFRC jackets through grooving method under eccentric loading: A comparative evaluation of steel and synthetic macro fibers in UHPFRC

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